Data Fusion Based Phase Space Reconstruction from Multi-Time Series

Rongxi Wang,Jianmin Gao,Zhiyong Gao,Xu Gao,Hongquan Jiang,Le Cui 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.6

Focused on the problem of imperfect information in the process of reconstruction from single time series, a new technology for phase space reconstruction from multi-time series based on the data fusion is proposed. Firstly, the methods Cao and mutual information are used to select the reconstruction parameters, time delay and embedded dimension; secondly, the social cognitive optimization algorithm is brought to calculate the weights for each variable; thirdly, an adaptive weighted fusion estimating method is applied for data fusion; lastly, the effectiveness of the methods mentioned in this paper is demonstrated by the analysis results of one case study of real chemical plant data sets, and the proposed methods in this paper can improve the completeness of the information of the reconstructed phase space, which is also a good foundation for further analysis of complex system.

A Novel Method for Lithium-ion Battery Remaining Useful Life Prediction Using Time Window and Gradient Boosting Decision Trees

Zhiyong Zheng,Jun Peng,Kunyuan Deng,Kai Gao,Heng Li,Bin Chen,Yingze Yang,Zhiwu Huang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Lithium-ion battery remaining useful life (RUL) is a key parameter on battery management system. Many machine learning methods are applied to RUL predictions, but they generally suffer from two limitations: (i) the extracted features fail to reflect the information hidden in the historical degradation status, and (ii) the accuracy cannot be guaranteed in the evaluation of battery degradation due to the non-linearity. In this paper, a new prediction method is proposed combining the time window (TW) and Gradient Boosting Decision Trees (GBDT). First, the energy (VCE) and the fluctuation index (VFI) of voltage signal are verified and selected as features. Then, a TW based feature extraction method is designed to extract features from the historical discharge process. After that, GBDT is adopted to model the relation of features and RUL. The proposed method is implemented on a recognized battery degradation dataset, and the advantages in accuracy are proven.

Improvement of ATP regeneration efficiency and operation stability in porcine interferon-α production by Pichia pastoris under lower induction temperature

Minjie Gao,Zhongping Shi,Shijuan Dong,Ruisong Yu,Jianrong Wu,Zhiyong Zheng,Xiaobei Zhan 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.6

The performance of traditional heterologous protein production by Pichia pastoris with methanol induction at 30 ℃ is poor, characterized by low ATP regeneration rate and weak operation stability. A low temperature induction strategy at 20 ℃ was thus adopted for efficient porcine interferon-α production in a 10 L fermentor. With the strategy,maximal methanol tolerance level could reach about 40 g/L to effectively deal with methanol concentration variations,so that the complicated on-line methanol measurement system could be eliminated. Moreover, metabolic analysis based on multiple state-variables measurements indicated that pIFN-α antiviral activity enhancement profited from the formation of an efficient ATP regeneration system at 20℃ induction. Compared to the induction strategy at 30 ℃, the proposed strategy increased the ATP regeneration rate by 49-66%, the maximal p_IFN-α antiviral activity was enhanced about 20-fold and reached a higher level of 1.5×10^6 IU/mL.

Correlation analysis of muscle amino acid deposition and gut microbiota profile of broilers reared at different ambient temperatures

Yang, Yuting,Gao, Huan,Li, Xing,Cao, Zhenhui,Li, Meiquan,Liu, Jianping,Qiao, Yingying,Ma, Li,Zhao, Zhiyong,Pan, Hongbin Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.1

Objective: Temperature could influence protein and amino acid deposition as well as gut microbiota profile and composition. However, the specific effects of ambient temperature on amino acids deposition and gut microbiota composition remain insufficiently understood. Methods: A total of 300 one-day-old Avian broilers were randomly divided into three groups and reared at high, medium, and low temperature (HT, MT, and LT), respectively. Breast muscle and fecal samples were collected for amino acid composition analysis and 16S rRNA gene sequence analysis. Results: Our data showed that compared to the MT group, there was a decrease of muscle leucine and tyrosine (p<0.05), as well as an increase of methionine in the HT group (p<0.05) and a decrease of serine in the LT group. Examination of microbiota shift revealed that at genus level, the relative abundance of Turicibacter and Parabacteroides was increased in the HT group (p<0.05) and that the relative abundances of Pandoraea, Achromobacter, Prevotella, Brevundimonas, and Stenotrophomonas in the LT group were higher than those in the MT group (p<0.05). In addition, there were substantial correlations between microbes and amino acids. In the HT group. Turicibacter was negatively correlated with aspartic acid and tyrosine, whereas Parabacteroides was positively correlated with methionine (p<0.05). In the LT group, there were multiple positive correlations between Achromobacter and arginine, isoleucine or tyrosine; between Prevotella and cysteine or phenylalanine; between Brevundimonas and cysteine; and between Stenotrophomonas and cysteine as well as a negative correlation between Stenotrophomonas and serine. Conclusion: Our findings demonstrated that amino acid content of breast muscle and intestinal microbiota profile was affected by different ambient temperatures. Under heat exposure, augmented abundance of Parabacteroides was correlated with elevated methionine. Low temperature treatment may affect muscle tyrosine content through the regulation of Achromobacter.

Self-reorganization of CdTe nanoparticles into two-dimensional Bi₂Te₃/CdTe nanosheets and their thermoelectrical properties

Yang, Jie,Gao, Yan,Kim, Jeoung Woo,He, Yujian,Song, Rui,Ahn, Chi Won,Tang, Zhiyong Royal Society of Chemistry 2010 Physical chemistry chemical physics Vol.12 No.38

<P>A partial cation exchange reaction between CdTe nanoparticles and Bi<SUP>3+</SUP> ions gives rise to spontaneous formation of two-dimensional Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets. The average size and thickness of the nanosheets are around 200 and 6.9 nm, respectively. Both CdTe and Bi<SUB>2</SUB>Te<SUB>3</SUB>, which are there as the form of nanoparticles with average sizes of 3.4 nm, are found to be homogenously distributed in the nanosheets. The Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets are further integrated into a pellet by using spark plasma sintering for optimizing thermoelectric performance. Compared with the bulk n-type Bi<SUB>2</SUB>Te<SUB>3</SUB>, the pellets composed of Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets exhibit a considerably low thermal conductivity, 0.63 W m<SUP>−1</SUP> K<SUP>−1</SUP>, and a slightly high Seebeck coefficient, −182.2 μV K<SUP>−1</SUP>, at room temperature.</P> <P>Graphic Abstract</P><P>Two-dimensional Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets are prepared through a self-reorganization strategy, and they show a rather high thermoelectrical performance. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp00079e'> </P>

Security Analysis of the Whirlpool Hash Function in the Cloud of Things

( Wei Li ),( Zhiyong Gao ),( Dawu Gu ),( Chenyu Ge ),( Linfeng Liao ),( Zhihong Zhou ),( Ya Liu ),( Zhiqiang Liu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.1

With the advancement and deployment of leading-edge telecommunication technologies for sensing and collecting, computing related information, Cloud of Things (CoTs) has emerged as a typical application platform that is envisioned to revolutionize the daily activities of human society, such as intelligent transportation, modern logistics, food safety, environmental monitoring, etc. To avoid any possible malicious attack and resource abuse, employing hash functions is widely recognized as one of the most effective approaches for CoTs to achieve message integrity and data authentication. The Whirlpool hash function has served as part of the joint ISO/IEC 10118-3 International Standard by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). In this paper, we propose an effective differential fault analysis on Whirlpool in the byte-oriented random fault model. The mathematical analysis and experimental results show that 8 random faults on average are required to obtain the current 512-bit message input of whirlpool and the secret key of HMAC-Whirlpool. Our work demonstrates that Whirlpool and HMAC-Whirlpool are both vulnerable to the single byte differential fault analysis. It provides a new reference for the security analysis of the same structure of the hash functions in the CoTs.

Effects of raw meat and process procedure on N^ε-carboxymethyl-lysine and N^ε-carboxyethyl-lysine formation in meat products

Yu, Ligang,Gao, Chang,Zeng, Maomao,He, Zhiyong,Wang, Linxiang,Zhang, Shuang,Chen, Jie 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.4

This work aimed to investigate the effects of stored raw meat and process procedures on $N^{\varepsilon}$-carboxymethyl-lysine (CML) and $N^{\varepsilon}$-carboxyethyl-lysine (CEL) generation in meat products. Meat products of raw pork were sterilized and pasteurized at different storage times (0-4 months) and the CML/CEL contents were determined. The results showed that the extent of lipid and protein oxidation of raw pork increased with increasing storage time. A linear correlation was found between thiobarbituric acid-reactive substances value/carbonyl content and CML/CEL in sterilized meat products, indicating that stored raw pork could promote CML/CEL formation under high temperature processing. Furthermore, mild heating temperatures seemed to favor CML formation, while high temperature could accelerate CEL generation. Therefore, formation kinetics of CML and CEL might be different for different process procedures. These results suggested that stored raw meat and processing temperature could significantly affect CML and CEL generation in meat products.

The genetic divergence and genetic structure of two closely related fish species Lateolabrax maculatus and Lateolabrax japonicus in the Northwestern Pacific inferred from AFLP markers

Zhiqiang Han,Gang Han,Zhiyong Wang,Bonian Shui,Tianxiang Gao 한국유전학회 2015 Genes & Genomics Vol.37 No.5

Amplified fragment length polymorphism markers were used to estimate the genetic divergence and genetic structure of Lateolabrax maculatus, L. japonicus and their possible hybrid populations in the Northwestern Pacific. Ninety one individuals were sampled from nine localities including two putative hybrid samples across the distribution range of the two species. Five primer combinations generated a total of 423 loci among 91 individuals of L. maculatus and L. japonicus, 266 of which were polymorphic (62.88 %). The percentage of polymorphic loci in three populations of L. maculatus and five populations of L. japonicus ranged from 31.96 % (Beihai) to 37.94 % (Weihai), 31.05 % (Ishikawa) to 49.29 % (Yatsushiro Sea), respectively. The UPGMA tree constructed with individuals of both species indicated reciprocal monophyletic relationship between L. japonicus and L. maculatus. Hybrid individuals between the two species in Ariake Sea and Yatsushiro Sea were identified by UPGMA tree and principal component analysis (PCA). The sympatry of two clades in the Yatsushiro Sea gave the first evidence of possible reproductive isolation between hybrid and L. japonicus. AMOVA analysis and pairwise FST revealed significant genetic differentiation within both species, indicating limited dispersal ability in two species. Historical isolation coupled with low dispersal ability was responsible for the genetic divergence between species and significant genetic structure in the two species.

Effect of electron irradiation on electronic structure of Ni41Co6Mn43Sn10 alloys

Sibo Sun,Jun Zhang,Zhiyong Gao,Wei Cai 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.1

Eff ect of electron irradiation on electronic structure of Ni 41 Co 6 Mn 43 Sn 10 alloys were investigatedby X-ray absorption fi ne structure, X-ray magnetic circular dichroism spectrometry and Mössbauerspectrometry. The local coordination environment of magnetic element signifi cant changes after electronirradiation, the change in the peak intensity of the Co L 3 edge is opposite to the Ni/Mn element,indicating that there is an electronic exchange between them. The crystal fi eld symmetry is broken, thehyperfi ne fi eld H in of the Ni 41 Co 6 Mn 43 Sn 10 alloy increases from 8.80 to 9.06 T. Meanwhile, the spinmagnetic moment of the Mn atom is signifi cantly increased after electron irradiation.

Effects of raw meat and process procedure on Nε-carboxymethyllysine and Nε-carboxyethyl-lysine formation in meat products

Ligang Yu,Chang Gao,Maomao Zeng,Zhiyong He,Linxiang Wang,Shuang Zhang,Jie Chen 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.4

This work aimed to investigate the effects of stored raw meat and process procedures onNε-carboxymethyl-lysine (CML) and Nε-carboxyethyl-lysine (CEL) generation in meat products. Meatproducts of raw pork were sterilized and pasteurized at different storage times (0-4 months) and theCML/CEL contents were determined. The results showed that the extent of lipid and protein oxidationof raw pork increased with increasing storage time. A linear correlation was found betweenthiobarbituric acid-reactive substances value/carbonyl content and CML/CEL in sterilized meatproducts, indicating that stored raw pork could promote CML/CEL formation under high temperatureprocessing. Furthermore, mild heating temperatures seemed to favor CML formation, while hightemperature could accelerate CEL generation. Therefore, formation kinetics of CML and CEL might bedifferent for different process procedures. These results suggested that stored raw meat andprocessing temperature could significantly affect CML and CEL generation in meat products.